The rep said that it's not a problem limited to Best Buy. It's been a growing problem lately.

Here's what he told the Consumerist:

"We — along with a growing number of other retailers —
are seeing increased attempts by hackers around the world to
target customer accounts on BestBuy.com and other online
retail sites, and compromise the stored user information.

"We are working to take care of our customers affected by these
attacks, crediting their accounts for any unauthorized purchases,
and requesting that they take the time now to protect their
online information (such as updating their BestBuy.com account
passwords, not using the same passwords across different
accounts, etc.)."

Apparently, the hackers haven't penetrated Best Buy's internal
databases. Instead, they "appear to be using combinations taken
elsewhere in an attempt to gain access to BestBuy.com accounts."

Still, it's concerning for consumers everywhere, especially since
many people use the same passwords for pretty much everything.